Zooming lens system

Details Zooming lens system Zooming lens system

1995-05-16

1997-03-11

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359684, G02B 1514

Patent

active

056107668

ABSTRACT:
The invention provides a zooming lens system which covers a wide-angle zone, has a zooming ratio of approximately 3 or higher, and is well corrected for various aberrations. This system comprises, in order from the object side, a first lens unit I having positive refracting power, a second lens unit II having negative refracting power, a third lens unit III having positive refracting power, a fourth lens unit IV having positive refracting power and a fifth lens unit V having positive refracting power, with at least said first, third, fourth and fifth lens units being moved toward the object side for zooming from the wide-angle end to the telephoto end, and conforms to the following conditions:

REFERENCES:
patent: 4189213 (1980-02-01), Iizuka
patent: 4501475 (1982-05-01), Fujita et al.
patent: 4696553 (1987-09-01), Tsuji et al.
patent: 4830477 (1989-05-01), Takahashi et al.
patent: 5056900 (1991-10-01), Mukaiya et al.

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